# Questions tagged [wolfram-alpha]

For mathematical questions related to the usage of WolframAlpha.

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### WolframAlpha syntax - evaluate series at a point

I am looking for syntax for WolframAlpha, which would evaluate a series at a given point. My goal is to have a sheet of practice exercises with links to solutions in WolframAlpha. Example problem: ...
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### Solve a 2D linear recurrence

I need to know the solution of this recurrence: $$2a[n,k-1]-a[n-1,k-1]-2a[n-1,k-2]+a[n-2,k-2]=a[n,k]$$ With the initial value unspecified. Also, wolfram is good at solving linear 1D recurrence, but ...
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### PDF or CDF of the sum of two Weibull random variables with shape parameter 1/2

I saw that the pdf of the sum of two independent Weibull random variables is not known in general. However, in the case of 'shape parameter = 1/2' in both variables, is there a closed-form expression ...
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### How can i use Maple(or any other software) to rearrange any equation into another equation? [closed]

Let's say I have some equation $= x^2+y=3$. I want to somehow rearrange this into something else such as $x=({\rm root}(3-y) z)/z$. I solved for x and multiplied z above and below. Can Maple (or some ...
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### Solving system of equations for trig problem in Wolfram Alpha

I'm new to Wolfram Alpha. I'm trying to learn how to do solving using a basic trig system of equations but I don't understand the ouput. The problem is stated in graphic below, I want to solve for t ...
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### HessianMatrix (norm(x)) in Wolfram

I'm very new to Wolfram-alpha. I'm trying to compute the Hessian Matrix of ||x|| where x is a vector. I tried this command HessianMatrix (norm[x]) in mathematica 13 where I use Wolframalpha input ...
• 416
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### Why is $i$ here?

So I was trying to put $$\sum_{n=2}^\infty\frac{(-1)^n}{\pi(n)}$$(where $\pi(n)$ is the prime counting function) into Wolfram Alpha. It didn't work. So I decided to replace $\pi(n)$ with $\ln n$. I ...
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### Why wolfram alpha is not showing integrand error?

$\tanh^{-1}$ of any real number whose modulus is $1$ or greater than $1$ is meaningless. So the following double integral must be meaningless. But when I computed the following double integral in ...
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### What does italic i mean in integral calculator?

In Wolfram Alpha I computed the following double integral: What does $i$ mean here? Does the result have imaginary part also?
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